OSPFv2 deep dive. Михайловский Василий Cisco TAC Poland Ноябрь 17, 2015
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1 OSPFv2 deep dive Михайловский Василий Cisco TAC Poland Ноябрь 17, 2015
2 Содержание TBD
3 OSPFv2 transport Using IP-multicast and ; Protocol number 89; Unicast for immediate hellos, retransmits and initial exchange; IP MTU from egress interface (announced in DBD); DSCP eq CS6 (dec 48), TOS eq 192;
4 SPF & LSDB concepts OSPF is Link-state protocol; Based on Dijkstra's algorithm; Building shortest path to remote node; Graph is build based on LSDB (link-state DB); Every link has a cost (cost to use the link); Path with lowest cost wins; LSDB consists of LSA (types 1,2,3,4,5,6,7); LSDB must be consistent across network.
5 LSA concept LSA is identified by ID; LSA must have: ID, age, seq number, checksum; MAX AGE (3600 sec) when LSA is purged from LSDB; SEQ number defines freshness on LSA (the higher the fresher); Checksum to verify consistency of LSA payload; LSAs 1,2,3,4,5,6,7 are used in LSDB (OSPFv2) to build graph.
6 OSPF area concept Area the way to segment your network; Area 0 Backbone area (the rest must be connected); Consistency is mandatory within an area; Area types: Backbone, normal, stub, totally-stub, nssa, totally nssa; ABR is to interconnect areas; ASBR is to connect external network to OSPF domain;
7 Network topology Lo0 eq x.x.x.x/32 Router-id eq Lo0 Link eq 10.x.y.x/24 R1,R2,R3,R4 area 100 R5,R6,R7 area 0 (ABRs); R8,R9 NSSA area 101.
8 LSA type1 Router LSA Describes all the interfaces/adjacencies an owner has; Identified by router-id (unique); Scope: single area; Topology needs 3 LSAs only; Area 100
9 LSA type2 Network LSA Needed due to SPF restrictions; Defines pseudo-node in the network; Scope: single area; Special roles defined DR / BDR; Slows down convergence time; NOT recommended in your CORE!
10 OSPFv2 wire/segment roles Designated router non-preemptive; Building network LSA; Updating network LSA; Managing segment updates Backup designated router - non-preemptive; Standby for DR; Takes over once DR is lost. DROTHER ;
11 LSA type3 Summary LSA Created by ABR; R5/R7 use LSA3 to reach anything in area 100; Scope: local area, may be replicated by area 0 ABR; RIB IA. Area 100 Area 0
12 LSA type5 External LSA Created by ASBR; IMPORTANT: concept of Forwarding address; Scope: normal areas; RIB E1/E2. Redistribute prefix A1
13 LSA type4 Summary router LSA Created by ASBR; IMPORTANT: concept of Forwarding address; Scope: normal areas; R5/R7 are using LSA5 to find ASBR, LSA4 to find the way to it; Redistribute prefix A1 Area 0
14 LSA type7 NSSA external LSA Created by ASBR in NSSA area; IMPORTANT: concept of Forwarding address; Scope: nssa areas only; ABR does translation into LSA5; RIB - N1/N2; Area 0 Area 200 NSSA Redistribute prefix B1
15 Injecting /0 LSA5 - default-information originate ; LSA3 [totally] stub area; LSA3 nssa (area 101 nssa no-summary); LSA7 nssa (area 101 nssa default-information-originate);
16 Routing decision / same prefix Intra-area; Inter-area; E1 E2 N1 N2 NX-OS behavior differs from IOS (RFC 1583 vs 2328)!
17 Building adjacency debug ip ospf adj Hello fields to match: Area number; Stub flag; Hello/dead interval (unless sub-second); Authentication type; Authentication data; within the same subnet; MTU (or MTU-ignore checked in DBD); Fields to be unique: Router-id;
18 OSPF network types Broadcast; Non-broadcast; Point-to-point; Loopback; Point-to-multipoint; Point-to-multipoint non-broadcast; Network type mix may lead to an issue.
19 Issue 1 stuck in EXSTART/EXCHANGE
20 More details on LSDB stale entry LSDB is a database of raw information for SPF algorithm; Is may have stale entries, that could confuse you! X
21 Issue 2 inconsistent network type R7#sh ip ospf ne Neighbor ID Pri State Dead Time Address Interface FULL/BDR 00:00: Ethernet0/3 R7#sh ip route % Network not in table R6#sh ip ospf ne Neighbor ID Pri State Dead Time Address Interface FULL/ - 00:00: Ethernet0/ FULL/ - 00:00: Ethernet0/1 R6#sh ip route % Network not in table
22 Issue 3 flood-war/duplicated router-id R3/R4 have same router-id LSDB symptoms: seq number is high; age time is low (under 15 sec). %OSPF-4-DUP_RTRID_AREA: Detected router with duplicate router ID in area 100 %OSPF-4-FLOOD_WAR: Process 1 flushes LSA ID y.y.y.y type-5 adv-rtr x.x.x.x in area 0 X X
23 Issue 4 FA missing in RIB (as inernal OSPF) R2#sh ip ospf data ext LS Type: AS External Link Link State ID: Advertising Router: LS Seq Number: Checksum: 0xF0C7 Length: 36 Network Mask: /8 Metric Type: 2 (Larger than any link state path) Metric: 200 Forward Address: ip access-list standard IN_OSPF deny permit any router ospf 1 distribute-list IN_OSPF in R2#sh ip route % Subnet not in table R2#sh ip route % Subnet not in table
24 Caveat 5 Running two OSPF processes Behavior depends on release, so distance manipulation is recommended; NX-OS compares only metric -> redistribution issues; IOS depends on a version, but compares prefix type: still does not compare fwd cost for E2/N2; oldest wins (older releases); lowest process ID wins (newer releases).
25 OSPF - graceful restart capability /NSF KEY: data-plane is not broken during control-plane convergence; CEF kept intact, while process may restart information exchange; Typically useful for RP switchover; Modes: router / helper operations;
26 Issue 6 NSF in VSS or stack design If we do graceful restart in stack due to master going down; Peer may use dead link in CEF; NSF freezes CEF forwarding broken; Solution: Avoid using L3 redundant links to different boxes; LFA FRR (if supported by a platform).
27 LFA FRR - Loop-Free Alternate Fast Reroute Allows to precompute backup path and build CEF adjacency; Fast reroute in case of link failure (without CEF change); Analog of EIGRP feasible successor; Possible in OSPF due to link-state nature of LSDB (possible to run SPF on behalf no other neighbors to find loop-free backup path); LFA election process is adjustable (by default - avoids SRLG first);
28 Remote LFA FRR Allows to precompute backup path and build CEF adjacency; Fast reroute in case of link failure (without CEF change); Works in case, when LFA could not find one-hop feasible successor uses multi-hop successor; Runs on top of MPLS and requires LDP;
29
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